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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM FCS 113 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx prepared for the proposed project by ENGEO Incorporated can be found in Appendix A; it contains site-specific recommendations for project design and construction that the proposed project would be required to implement. Additionally, ENGEO Incorporated prepared a response to geotechnical peer review comments provided by the City (Appendix A). No new geologic hazards were identified as a result of the peer review process. Therefore, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those previously identified in the Prior FEIR. No additional analysis is required. e) Septic Tanks Would the project: Have soils incapable of supporting the use of septic tanks or other alternative wastewater disposal systems where sewers are not available? Prior FEIR Conclusions The Prior FEIR confirmed that the County Project would include the development of a WWTP on approximately 1 acre. The WWTP would be a package membrane bioreactor WWTP that would treat approximately 50,000 gallons per day (gpd) of wastewater. The WWTP would include an influent pump station, a headworks facility, odor control, a membrane bioreactor facility, ultraviolet disinfection, an effluent and recycled water pump station and pipelines, solids handling, a chemical facility, administration, laboratory, operations, and maintenance. The proposed WWTP would not rely on subsurface disposal and would produce disinfected tertiary recycled water as defined in California Code of Regulations, Title 22, Section 60301.230. All recycled water discharged from the WWTP would be treated pursuant to applicable State laws and regulations, and the project applicant would be required to file a Notice of Intent under the Statewide General Recycled Water Order. With respect to Alternative 2, the Prior FEIR determined that construction of the WWTP would not occur because Alternative 2 would connect to the City’s sanitary sewer system, reducing any potential impacts related to alternative wastewater disposal systems. Therefore, the Prior FEIR concluded that impacts associated with the County Project and Alternative 2 would be less than significant. (Draft EIR, pp. 3.6-22, 6-14). Proposed Project Analysis and Conclusion In contrast to the County Project, sanitary sewer services for the proposed project would be provided by the City, and the off-site WWTP and associated improvements would not be constructed. As such, the proposed project would have no impact related to the use of septic tanks or alternative wastewater disposal systems. Therefore, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those analyzed in the Prior FEIR. No additional analysis is required.